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Shareowners' Equity and Noncontrolling Interest (Summary of Changes in AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (7,327) | $ (7,729) | $ (7,327) | $ (7,729) | $ (7,964) | $ (8,334) | $ (7,484) | $ (7,619)
Other comprehensive (loss) income before reclassifications, net - Foreign Currency Translation | 514 | (359) | 909 | (596) |  |  |  |
Amounts reclassified, pretax - Foreign Currency Translation | 3 | 1 | 3 | 0 |  |  |  |
Tax (benefit) expense reclassified - Foreign Currency Translation | 0 | 0 | 0 | 0 |  |  |  |
Other comprehensive (loss) income before reclassifications, net - Pension | 37 | (4) | 39 | 21 |  |  |  |
Amounts reclassified, pretax - Pension | 132 | 127 | 395 | 381 |  |  |  |
Tax (benefit) expense reclassified - Pension | 66 | 47 | 164 | 140 |  |  |  |
Other comprehensive (loss) income before reclassifications, net - AFS Securities | 12 | 30 | 11 | 87 |  |  |  |
Amounts reclassified, pretax - AFS Securities | 138 | 20 | 545 | 72 |  |  |  |
Tax (benefit) expense reclassified - AFS Securities | 50 | 8 | 205 | 27 |  |  |  |
Other comprehensive (loss) income before reclassifications, net - Unrealized Hedging (Losses) Gains | 232 | (5) | 332 | 138 |  |  |  |
Amounts reclassified, pretax - Unrealized Hedging (Losses) Gains | 24 | (32) | 14 | (139) |  |  |  |
Tax (benefit) expense reclassified - Unrealized Hedging (Losses) Gains | 5 | (9) | 3 | (37) |  |  |  |
Other comprehensive (loss) income before reclassifications, net | 681 | (335) | 1,130 | (408) |  |  |  |
Amounts reclassified, pretax | 33 | (138) | 167 | (448) |  |  |  |
Tax (benefit) expense reclassified | (11) | (48) | 44 | (150) |  |  |  |
Foreign Currency Translation |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (2,657) | (3,050) | (2,657) | (3,050) | (3,128) | (3,480) | (2,685) | (2,438)
Other comprehensive (loss) income before reclassifications, net - Foreign Currency Translation | 474 | (364) | 826 | (612) |  |  |  |
Defined Benefit Pension and Post-retirement Plans |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (4,853) | (4,915) | (4,853) | (4,915) | (4,882) | (5,045) | (4,999) | (5,135)
Unrealized Gains (Losses) on Available-for-Sale Securities |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 24 | 335 | 24 | 335 | 100 | 353 | 317 | 293
Unrealized Hedging (Losses) Gains |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ 159 | $ (99) | 159 | $ (99) | $ (54) | $ (162) | $ (117) | $ (339)
Sales of significant investments in AFS securities [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Amounts reclassified, pretax - Unrealized Hedging (Losses) Gains |  |  | $ 500 |  |  |  |  |

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